//-----------------------------------------------------------------------------
// File: DSUtil.cpp
//
// Desc: DirectSound framework classes for reading and writing wav files and
//       playing them in DirectSound buffers. Feel free to use this class 
//       as a starting point for adding extra functionality.
//
// Copyright (c) Microsoft Corp. All rights reserved.
//-----------------------------------------------------------------------------
#define STRICT
#include <windows.h>
#include <mmsystem.h>
//#include <dxerr9.h>
#include <DxErr.h>
#include <dsound.h>
#include "DSUtil.h"
#include "DXUtil.h"




//-----------------------------------------------------------------------------
// Name: CSoundManager::CSoundManager()
// Desc: Constructs the class
//-----------------------------------------------------------------------------
CSoundManager::CSoundManager()
{
	m_pDS = NULL;
}




//-----------------------------------------------------------------------------
// Name: CSoundManager::~CSoundManager()
// Desc: Destroys the class
//-----------------------------------------------------------------------------
CSoundManager::~CSoundManager()
{
	SAFE_RELEASE( m_pDS ); 
}




//-----------------------------------------------------------------------------
// Name: CSoundManager::Initialize()
// Desc: Initializes the IDirectSound object and also sets the primary buffer
//       format.  This function must be called before any others.
//-----------------------------------------------------------------------------
HRESULT CSoundManager::Initialize( HWND  hWnd, 
	DWORD dwCoopLevel )
{
	HRESULT             hr;

	SAFE_RELEASE( m_pDS );

	// Create IDirectSound using the primary sound device
	if( FAILED( hr = DirectSoundCreate8( NULL, &m_pDS, NULL ) ) )
		return DXTRACE_ERR( TEXT("DirectSoundCreate8"), hr );

	// Set DirectSound coop level 
	if( FAILED( hr = m_pDS->SetCooperativeLevel( hWnd, dwCoopLevel ) ) )
		return DXTRACE_ERR( TEXT("SetCooperativeLevel"), hr );   

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CSoundManager::SetPrimaryBufferFormat()
// Desc: Set primary buffer to a specified format 
//       !WARNING! - Setting the primary buffer format and then using this
//                   same dsound object for DirectMusic messes up DirectMusic! 
//       For example, to set the primary buffer format to 22kHz stereo, 16-bit
//       then:   dwPrimaryChannels = 2
//               dwPrimaryFreq     = 22050, 
//               dwPrimaryBitRate  = 16
//-----------------------------------------------------------------------------
HRESULT CSoundManager::SetPrimaryBufferFormat( DWORD dwPrimaryChannels, 
	DWORD dwPrimaryFreq, 
	DWORD dwPrimaryBitRate )
{
	HRESULT             hr;
	LPDIRECTSOUNDBUFFER pDSBPrimary = NULL;

	if( m_pDS == NULL )
		return CO_E_NOTINITIALIZED;

	// Get the primary buffer 
	DSBUFFERDESC dsbd;
	ZeroMemory( &dsbd, sizeof(DSBUFFERDESC) );
	dsbd.dwSize        = sizeof(DSBUFFERDESC);
	dsbd.dwFlags       = DSBCAPS_PRIMARYBUFFER;
	dsbd.dwBufferBytes = 0;
	dsbd.lpwfxFormat   = NULL;

	if( FAILED( hr = m_pDS->CreateSoundBuffer( &dsbd, &pDSBPrimary, NULL ) ) )
		return DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );

	WAVEFORMATEX wfx;
	ZeroMemory( &wfx, sizeof(WAVEFORMATEX) ); 
	wfx.wFormatTag      = (WORD) WAVE_FORMAT_PCM; 
	wfx.nChannels       = (WORD) dwPrimaryChannels; 
	wfx.nSamplesPerSec  = (DWORD) dwPrimaryFreq; 
	wfx.wBitsPerSample  = (WORD) dwPrimaryBitRate; 
	wfx.nBlockAlign     = (WORD) (wfx.wBitsPerSample / 8 * wfx.nChannels);
	wfx.nAvgBytesPerSec = (DWORD) (wfx.nSamplesPerSec * wfx.nBlockAlign);

	if( FAILED( hr = pDSBPrimary->SetFormat(&wfx) ) )
		return DXTRACE_ERR( TEXT("SetFormat"), hr );

	SAFE_RELEASE( pDSBPrimary );

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CSoundManager::Get3DListenerInterface()
// Desc: Returns the 3D listener interface associated with primary buffer.
//-----------------------------------------------------------------------------
HRESULT CSoundManager::Get3DListenerInterface( LPDIRECTSOUND3DLISTENER* ppDSListener )
{
	HRESULT             hr;
	DSBUFFERDESC        dsbdesc;
	LPDIRECTSOUNDBUFFER pDSBPrimary = NULL;

	if( ppDSListener == NULL )
		return E_INVALIDARG;
	if( m_pDS == NULL )
		return CO_E_NOTINITIALIZED;

	*ppDSListener = NULL;

	// Obtain primary buffer, asking it for 3D control
	ZeroMemory( &dsbdesc, sizeof(DSBUFFERDESC) );
	dsbdesc.dwSize = sizeof(DSBUFFERDESC);
	dsbdesc.dwFlags = DSBCAPS_CTRL3D | DSBCAPS_PRIMARYBUFFER;
	if( FAILED( hr = m_pDS->CreateSoundBuffer( &dsbdesc, &pDSBPrimary, NULL ) ) )
		return DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );

	if( FAILED( hr = pDSBPrimary->QueryInterface( IID_IDirectSound3DListener, 
		(VOID**)ppDSListener ) ) )
	{
		SAFE_RELEASE( pDSBPrimary );
		return DXTRACE_ERR( TEXT("QueryInterface"), hr );
	}

	// Release the primary buffer, since it is not need anymore
	SAFE_RELEASE( pDSBPrimary );

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CSoundManager::Create()
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CSoundManager::Create( CSound** ppSound, 
	LPTSTR strWaveFileName, 
	DWORD dwCreationFlags, 
	GUID guid3DAlgorithm,
	DWORD dwNumBuffers )
{
	HRESULT hr;
	HRESULT hrRet = S_OK;
	DWORD   i;
	LPDIRECTSOUNDBUFFER* apDSBuffer     = NULL;
	DWORD                dwDSBufferSize = NULL;
	CWaveFile*           pWaveFile      = NULL;

	if( m_pDS == NULL )
		return CO_E_NOTINITIALIZED;
	if( strWaveFileName == NULL || ppSound == NULL || dwNumBuffers < 1 )
		return E_INVALIDARG;

	apDSBuffer = new LPDIRECTSOUNDBUFFER[dwNumBuffers];
	if( apDSBuffer == NULL )
	{
		hr = E_OUTOFMEMORY;
		goto LFail;
	}

	pWaveFile = new CWaveFile();
	if( pWaveFile == NULL )
	{
		hr = E_OUTOFMEMORY;
		goto LFail;
	}

	pWaveFile->Open( strWaveFileName, NULL, WAVEFILE_READ );

	if( pWaveFile->GetSize() == 0 )
	{
		// Wave is blank, so don't create it.
		hr = E_FAIL;
		goto LFail;
	}

	// Make the DirectSound buffer the same size as the wav file
	dwDSBufferSize = pWaveFile->GetSize();

	// Create the direct sound buffer, and only request the flags needed
	// since each requires some overhead and limits if the buffer can 
	// be hardware accelerated
	DSBUFFERDESC dsbd;
	ZeroMemory( &dsbd, sizeof(DSBUFFERDESC) );
	dsbd.dwSize          = sizeof(DSBUFFERDESC);
	dsbd.dwFlags         = dwCreationFlags;
	dsbd.dwBufferBytes   = dwDSBufferSize;
	dsbd.guid3DAlgorithm = guid3DAlgorithm;
	dsbd.lpwfxFormat     = pWaveFile->m_pwfx;

	// DirectSound is only guarenteed to play PCM data.  Other
	// formats may or may not work depending the sound card driver.
	hr = m_pDS->CreateSoundBuffer( &dsbd, &apDSBuffer[0], NULL );

	// Be sure to return this error code if it occurs so the
	// callers knows this happened.
	if( hr == DS_NO_VIRTUALIZATION )
		hrRet = DS_NO_VIRTUALIZATION;

	if( FAILED(hr) )
	{
		// DSERR_BUFFERTOOSMALL will be returned if the buffer is
		// less than DSBSIZE_FX_MIN and the buffer is created
		// with DSBCAPS_CTRLFX.

		// It might also fail if hardware buffer mixing was requested
		// on a device that doesn't support it.
		DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );

		goto LFail;
	}

	// Default to use DuplicateSoundBuffer() when created extra buffers since always 
	// create a buffer that uses the same memory however DuplicateSoundBuffer() will fail if 
	// DSBCAPS_CTRLFX is used, so use CreateSoundBuffer() instead in this case.
	if( (dwCreationFlags & DSBCAPS_CTRLFX) == 0 )
	{
		for( i=1; i<dwNumBuffers; i++ )
		{
			if( FAILED( hr = m_pDS->DuplicateSoundBuffer( apDSBuffer[0], &apDSBuffer[i] ) ) )
			{
				DXTRACE_ERR( TEXT("DuplicateSoundBuffer"), hr );
				goto LFail;
			}
		}
	}
	else
	{
		for( i=1; i<dwNumBuffers; i++ )
		{
			hr = m_pDS->CreateSoundBuffer( &dsbd, &apDSBuffer[i], NULL );
			if( FAILED(hr) )
			{
				DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );
				goto LFail;
			}
		}
	}

	// Create the sound
	*ppSound = new CSound( apDSBuffer, dwDSBufferSize, dwNumBuffers, pWaveFile, dwCreationFlags );

	SAFE_DELETE( apDSBuffer );
	return hrRet;

LFail:
	// Cleanup
	SAFE_DELETE( pWaveFile );
	SAFE_DELETE( apDSBuffer );
	return hr;
}









//-----------------------------------------------------------------------------
// Name: CSoundManager::CreateFromMemory()
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CSoundManager::CreateFromMemory( CSound** ppSound, 
	BYTE* pbData,
	ULONG  ulDataSize,
	LPWAVEFORMATEX pwfx,
	DWORD dwCreationFlags, 
	GUID guid3DAlgorithm,
	DWORD dwNumBuffers )
{
	HRESULT hr;
	DWORD   i;
	LPDIRECTSOUNDBUFFER* apDSBuffer     = NULL;
	DWORD                dwDSBufferSize = NULL;
	CWaveFile*           pWaveFile      = NULL;

	if( m_pDS == NULL )
		return CO_E_NOTINITIALIZED;
	if( pbData == NULL || ppSound == NULL || dwNumBuffers < 1 )
		return E_INVALIDARG;

	apDSBuffer = new LPDIRECTSOUNDBUFFER[dwNumBuffers];
	if( apDSBuffer == NULL )
	{
		hr = E_OUTOFMEMORY;
		goto LFail;
	}

	pWaveFile = new CWaveFile();
	if( pWaveFile == NULL )
	{
		hr = E_OUTOFMEMORY;
		goto LFail;
	}

	pWaveFile->OpenFromMemory( pbData,ulDataSize, pwfx, WAVEFILE_READ );


	// Make the DirectSound buffer the same size as the wav file
	dwDSBufferSize = ulDataSize;

	// Create the direct sound buffer, and only request the flags needed
	// since each requires some overhead and limits if the buffer can 
	// be hardware accelerated
	DSBUFFERDESC dsbd;
	ZeroMemory( &dsbd, sizeof(DSBUFFERDESC) );
	dsbd.dwSize          = sizeof(DSBUFFERDESC);
	dsbd.dwFlags         = dwCreationFlags;
	dsbd.dwBufferBytes   = dwDSBufferSize;
	dsbd.guid3DAlgorithm = guid3DAlgorithm;
	dsbd.lpwfxFormat     = pwfx;

	if( FAILED( hr = m_pDS->CreateSoundBuffer( &dsbd, &apDSBuffer[0], NULL ) ) )
	{
		DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );
		goto LFail;
	}

	// Default to use DuplicateSoundBuffer() when created extra buffers since always 
	// create a buffer that uses the same memory however DuplicateSoundBuffer() will fail if 
	// DSBCAPS_CTRLFX is used, so use CreateSoundBuffer() instead in this case.
	if( (dwCreationFlags & DSBCAPS_CTRLFX) == 0 )
	{
		for( i=1; i<dwNumBuffers; i++ )
		{
			if( FAILED( hr = m_pDS->DuplicateSoundBuffer( apDSBuffer[0], &apDSBuffer[i] ) ) )
			{
				DXTRACE_ERR( TEXT("DuplicateSoundBuffer"), hr );
				goto LFail;
			}
		}
	}
	else
	{
		for( i=1; i<dwNumBuffers; i++ )
		{
			hr = m_pDS->CreateSoundBuffer( &dsbd, &apDSBuffer[i], NULL );
			if( FAILED(hr) )
			{
				DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );
				goto LFail;
			}
		}
	}

	// Create the sound
	*ppSound = new CSound( apDSBuffer, dwDSBufferSize, dwNumBuffers, pWaveFile, dwCreationFlags );

	SAFE_DELETE( apDSBuffer );
	return S_OK;

LFail:
	// Cleanup

	SAFE_DELETE( apDSBuffer );
	return hr;
}





//-----------------------------------------------------------------------------
// Name: CSoundManager::CreateStreaming()
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CSoundManager::CreateStreaming( CStreamingSound** ppStreamingSound, 
	LPTSTR strWaveFileName, 
	DWORD dwCreationFlags, 
	GUID guid3DAlgorithm,
	DWORD dwNotifyCount, 
	DWORD dwNotifySize, 
	HANDLE hNotifyEvent )
{
	HRESULT hr;

	if( m_pDS == NULL )
		return CO_E_NOTINITIALIZED;
	if( strWaveFileName == NULL || ppStreamingSound == NULL || hNotifyEvent == NULL )
		return E_INVALIDARG;

	LPDIRECTSOUNDBUFFER pDSBuffer      = NULL;
	DWORD               dwDSBufferSize = NULL;
	CWaveFile*          pWaveFile      = NULL;
	DSBPOSITIONNOTIFY*  aPosNotify     = NULL; 
	LPDIRECTSOUNDNOTIFY pDSNotify      = NULL;

	pWaveFile = new CWaveFile();
	if( pWaveFile == NULL )
		return E_OUTOFMEMORY;
	pWaveFile->Open( strWaveFileName, NULL, WAVEFILE_READ );

	// Figure out how big the DSound buffer should be 
	dwDSBufferSize = dwNotifySize * dwNotifyCount;

	// Set up the direct sound buffer.  Request the NOTIFY flag, so
	// that we are notified as the sound buffer plays.  Note, that using this flag
	// may limit the amount of hardware acceleration that can occur. 
	DSBUFFERDESC dsbd;
	ZeroMemory( &dsbd, sizeof(DSBUFFERDESC) );
	dsbd.dwSize          = sizeof(DSBUFFERDESC);
	dsbd.dwFlags         = dwCreationFlags | 
		DSBCAPS_CTRLPOSITIONNOTIFY | 
		DSBCAPS_GETCURRENTPOSITION2;
	dsbd.dwBufferBytes   = dwDSBufferSize;
	dsbd.guid3DAlgorithm = guid3DAlgorithm;
	dsbd.lpwfxFormat     = pWaveFile->m_pwfx;

	if( FAILED( hr = m_pDS->CreateSoundBuffer( &dsbd, &pDSBuffer, NULL ) ) )
	{
		// If wave format isn't then it will return 
		// either DSERR_BADFORMAT or E_INVALIDARG
		if( hr == DSERR_BADFORMAT || hr == E_INVALIDARG )
			return DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );

		return DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr );
	}

	// Create the notification events, so that we know when to fill
	// the buffer as the sound plays. 
	if( FAILED( hr = pDSBuffer->QueryInterface( IID_IDirectSoundNotify, 
		(VOID**)&pDSNotify ) ) )
	{
		SAFE_DELETE_ARRAY( aPosNotify );
		return DXTRACE_ERR( TEXT("QueryInterface"), hr );
	}

	aPosNotify = new DSBPOSITIONNOTIFY[ dwNotifyCount ];
	if( aPosNotify == NULL )
		return E_OUTOFMEMORY;

	for( DWORD i = 0; i < dwNotifyCount; i++ )
	{
		aPosNotify[i].dwOffset     = (dwNotifySize * i) + dwNotifySize - 1;
		aPosNotify[i].hEventNotify = hNotifyEvent;             
	}

	// Tell DirectSound when to notify us. The notification will come in the from 
	// of signaled events that are handled in WinMain()
	if( FAILED( hr = pDSNotify->SetNotificationPositions( dwNotifyCount, 
		aPosNotify ) ) )
	{
		SAFE_RELEASE( pDSNotify );
		SAFE_DELETE_ARRAY( aPosNotify );
		return DXTRACE_ERR( TEXT("SetNotificationPositions"), hr );
	}

	SAFE_RELEASE( pDSNotify );
	SAFE_DELETE_ARRAY( aPosNotify );

	// Create the sound
	*ppStreamingSound = new CStreamingSound( pDSBuffer, dwDSBufferSize, pWaveFile, dwNotifySize );

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CSound::CSound()
// Desc: Constructs the class
//-----------------------------------------------------------------------------
CSound::CSound( LPDIRECTSOUNDBUFFER* apDSBuffer, DWORD dwDSBufferSize, 
	DWORD dwNumBuffers, CWaveFile* pWaveFile, DWORD dwCreationFlags )
{
	DWORD i;

	m_apDSBuffer = new LPDIRECTSOUNDBUFFER[dwNumBuffers];
	if( NULL != m_apDSBuffer )
	{
		for( i=0; i<dwNumBuffers; i++ )
			m_apDSBuffer[i] = apDSBuffer[i];

		m_dwDSBufferSize = dwDSBufferSize;
		m_dwNumBuffers   = dwNumBuffers;
		m_pWaveFile      = pWaveFile;
		m_dwCreationFlags = dwCreationFlags;

		FillBufferWithSound( m_apDSBuffer[0], FALSE );
	}
}




//-----------------------------------------------------------------------------
// Name: CSound::~CSound()
// Desc: Destroys the class
//-----------------------------------------------------------------------------
CSound::~CSound()
{
	for( DWORD i=0; i<m_dwNumBuffers; i++ )
	{
		SAFE_RELEASE( m_apDSBuffer[i] ); 
	}

	SAFE_DELETE_ARRAY( m_apDSBuffer ); 
	SAFE_DELETE( m_pWaveFile );
}




//-----------------------------------------------------------------------------
// Name: CSound::FillBufferWithSound()
// Desc: Fills a DirectSound buffer with a sound file 
//-----------------------------------------------------------------------------
HRESULT CSound::FillBufferWithSound( LPDIRECTSOUNDBUFFER pDSB, BOOL bRepeatWavIfBufferLarger )
{
	HRESULT hr; 
	VOID*   pDSLockedBuffer      = NULL; // Pointer to locked buffer memory
	DWORD   dwDSLockedBufferSize = 0;    // Size of the locked DirectSound buffer
	DWORD   dwWavDataRead        = 0;    // Amount of data read from the wav file 

	if( pDSB == NULL )
		return CO_E_NOTINITIALIZED;

	// Make sure we have focus, and we didn't just switch in from
	// an app which had a DirectSound device
	if( FAILED( hr = RestoreBuffer( pDSB, NULL ) ) ) 
		return DXTRACE_ERR( TEXT("RestoreBuffer"), hr );

	// Lock the buffer down
	if( FAILED( hr = pDSB->Lock( 0, m_dwDSBufferSize, 
		&pDSLockedBuffer, &dwDSLockedBufferSize, 
		NULL, NULL, 0L ) ) )
		return DXTRACE_ERR( TEXT("Lock"), hr );

	// Reset the wave file to the beginning 
	m_pWaveFile->ResetFile();

	if( FAILED( hr = m_pWaveFile->Read( (BYTE*) pDSLockedBuffer,
		dwDSLockedBufferSize, 
		&dwWavDataRead ) ) )           
		return DXTRACE_ERR( TEXT("Read"), hr );

	if( dwWavDataRead == 0 )
	{
		// Wav is blank, so just fill with silence
		FillMemory( (BYTE*) pDSLockedBuffer, 
			dwDSLockedBufferSize, 
			(BYTE)(m_pWaveFile->m_pwfx->wBitsPerSample == 8 ? 128 : 0 ) );
	}
	else if( dwWavDataRead < dwDSLockedBufferSize )
	{
		// If the wav file was smaller than the DirectSound buffer, 
		// we need to fill the remainder of the buffer with data 
		if( bRepeatWavIfBufferLarger )
		{       
			// Reset the file and fill the buffer with wav data
			DWORD dwReadSoFar = dwWavDataRead;    // From previous call above.
			while( dwReadSoFar < dwDSLockedBufferSize )
			{  
				// This will keep reading in until the buffer is full 
				// for very short files
				if( FAILED( hr = m_pWaveFile->ResetFile() ) )
					return DXTRACE_ERR( TEXT("ResetFile"), hr );

				hr = m_pWaveFile->Read( (BYTE*)pDSLockedBuffer + dwReadSoFar,
					dwDSLockedBufferSize - dwReadSoFar,
					&dwWavDataRead );
				if( FAILED(hr) )
					return DXTRACE_ERR( TEXT("Read"), hr );

				dwReadSoFar += dwWavDataRead;
			} 
		}
		else
		{
			// Don't repeat the wav file, just fill in silence 
			FillMemory( (BYTE*) pDSLockedBuffer + dwWavDataRead, 
				dwDSLockedBufferSize - dwWavDataRead, 
				(BYTE)(m_pWaveFile->m_pwfx->wBitsPerSample == 8 ? 128 : 0 ) );
		}
	}

	// Unlock the buffer, we don't need it anymore.
	pDSB->Unlock( pDSLockedBuffer, dwDSLockedBufferSize, NULL, 0 );

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CSound::RestoreBuffer()
// Desc: Restores the lost buffer. *pbWasRestored returns TRUE if the buffer was 
//       restored.  It can also NULL if the information is not needed.
//-----------------------------------------------------------------------------
HRESULT CSound::RestoreBuffer( LPDIRECTSOUNDBUFFER pDSB, BOOL* pbWasRestored )
{
	HRESULT hr;

	if( pDSB == NULL )
		return CO_E_NOTINITIALIZED;
	if( pbWasRestored )
		*pbWasRestored = FALSE;

	DWORD dwStatus;
	if( FAILED( hr = pDSB->GetStatus( &dwStatus ) ) )
		return DXTRACE_ERR( TEXT("GetStatus"), hr );

	if( dwStatus & DSBSTATUS_BUFFERLOST )
	{
		// Since the app could have just been activated, then
		// DirectSound may not be giving us control yet, so 
		// the restoring the buffer may fail.  
		// If it does, sleep until DirectSound gives us control.
		do 
		{
			hr = pDSB->Restore();
			if( hr == DSERR_BUFFERLOST )
				Sleep( 10 );
		}
		while( ( hr = pDSB->Restore() ) == DSERR_BUFFERLOST );

		if( pbWasRestored != NULL )
			*pbWasRestored = TRUE;

		return S_OK;
	}
	else
	{
		return S_FALSE;
	}
}




//-----------------------------------------------------------------------------
// Name: CSound::GetFreeBuffer()
// Desc: Finding the first buffer that is not playing and return a pointer to 
//       it, or if all are playing return a pointer to a randomly selected buffer.
//-----------------------------------------------------------------------------
LPDIRECTSOUNDBUFFER CSound::GetFreeBuffer()
{
	DWORD i;
	if( m_apDSBuffer == NULL )
		return FALSE; 

	for( i=0; i<m_dwNumBuffers; i++ )
	{
		if( m_apDSBuffer[i] )
		{  
			DWORD dwStatus = 0;
			m_apDSBuffer[i]->GetStatus( &dwStatus );
			if ( ( dwStatus & DSBSTATUS_PLAYING ) == 0 )
				break;
		}
	}

	if( i != m_dwNumBuffers )
		return m_apDSBuffer[ i ];
	else
		return m_apDSBuffer[ rand() % m_dwNumBuffers ];
}




//-----------------------------------------------------------------------------
// Name: CSound::GetBuffer()
// Desc: 
//-----------------------------------------------------------------------------
LPDIRECTSOUNDBUFFER CSound::GetBuffer( DWORD dwIndex )
{
	if( m_apDSBuffer == NULL )
		return NULL;
	if( dwIndex >= m_dwNumBuffers )
		return NULL;

	return m_apDSBuffer[dwIndex];
}




//-----------------------------------------------------------------------------
// Name: CSound::Get3DBufferInterface()
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CSound::Get3DBufferInterface( DWORD dwIndex, LPDIRECTSOUND3DBUFFER* ppDS3DBuffer )
{
	if( m_apDSBuffer == NULL )
		return CO_E_NOTINITIALIZED;
	if( dwIndex >= m_dwNumBuffers )
		return E_INVALIDARG;

	*ppDS3DBuffer = NULL;

	return m_apDSBuffer[dwIndex]->QueryInterface( IID_IDirectSound3DBuffer, 
		(VOID**)ppDS3DBuffer );
}


//-----------------------------------------------------------------------------
// Name: CSound::Play()
// Desc: Plays the sound using voice management flags.  Pass in DSBPLAY_LOOPING
//       in the dwFlags to loop the sound
//-----------------------------------------------------------------------------
HRESULT CSound::Play( DWORD dwPriority, DWORD dwFlags, LONG lVolume, LONG lFrequency, LONG lPan )
{
	HRESULT hr;
	BOOL    bRestored;

	if( m_apDSBuffer == NULL )
		return CO_E_NOTINITIALIZED;

	LPDIRECTSOUNDBUFFER pDSB = GetFreeBuffer();

	if( pDSB == NULL )
		return DXTRACE_ERR( TEXT("GetFreeBuffer"), E_FAIL );

	// Restore the buffer if it was lost
	if( FAILED( hr = RestoreBuffer( pDSB, &bRestored ) ) )
		return DXTRACE_ERR( TEXT("RestoreBuffer"), hr );

	if( bRestored )
	{
		// The buffer was restored, so we need to fill it with new data
		if( FAILED( hr = FillBufferWithSound( pDSB, FALSE ) ) )
			return DXTRACE_ERR( TEXT("FillBufferWithSound"), hr );
	}

	if( m_dwCreationFlags & DSBCAPS_CTRLVOLUME )
	{
		pDSB->SetVolume( lVolume );
	}

	if( lFrequency != -1 && 
		(m_dwCreationFlags & DSBCAPS_CTRLFREQUENCY) )
	{
		pDSB->SetFrequency( lFrequency );
	}

	if( m_dwCreationFlags & DSBCAPS_CTRLPAN )
	{
		pDSB->SetPan( lPan );
	}

	return pDSB->Play( 0, dwPriority, dwFlags );
}




//-----------------------------------------------------------------------------
// Name: CSound::Play3D()
// Desc: Plays the sound using voice management flags.  Pass in DSBPLAY_LOOPING
//       in the dwFlags to loop the sound
//-----------------------------------------------------------------------------
HRESULT CSound::Play3D( LPDS3DBUFFER p3DBuffer, DWORD dwPriority, DWORD dwFlags, LONG lFrequency )
{
	HRESULT hr;
	BOOL    bRestored;
	DWORD   dwBaseFrequency;

	if( m_apDSBuffer == NULL )
		return CO_E_NOTINITIALIZED;

	LPDIRECTSOUNDBUFFER pDSB = GetFreeBuffer();
	if( pDSB == NULL )
		return DXTRACE_ERR( TEXT("GetFreeBuffer"), E_FAIL );

	// Restore the buffer if it was lost
	if( FAILED( hr = RestoreBuffer( pDSB, &bRestored ) ) )
		return DXTRACE_ERR( TEXT("RestoreBuffer"), hr );

	if( bRestored )
	{
		// The buffer was restored, so we need to fill it with new data
		if( FAILED( hr = FillBufferWithSound( pDSB, FALSE ) ) )
			return DXTRACE_ERR( TEXT("FillBufferWithSound"), hr );
	}

	if( m_dwCreationFlags & DSBCAPS_CTRLFREQUENCY )
	{
		pDSB->GetFrequency( &dwBaseFrequency );
		pDSB->SetFrequency( dwBaseFrequency + lFrequency );
	}

	// QI for the 3D buffer 
	LPDIRECTSOUND3DBUFFER pDS3DBuffer;
	hr = pDSB->QueryInterface( IID_IDirectSound3DBuffer, (VOID**) &pDS3DBuffer );
	if( SUCCEEDED( hr ) )
	{
		hr = pDS3DBuffer->SetAllParameters( p3DBuffer, DS3D_IMMEDIATE );
		if( SUCCEEDED( hr ) )
		{
			hr = pDSB->Play( 0, dwPriority, dwFlags );
		}

		pDS3DBuffer->Release();
	}

	return hr;
}



//-----------------------------------------------------------------------------
// Name: CSound::Stop()
// Desc: Stops the sound from playing
//-----------------------------------------------------------------------------
HRESULT CSound::Stop()
{
	if( m_apDSBuffer == NULL )
		return CO_E_NOTINITIALIZED;

	HRESULT hr = 0;

	for( DWORD i=0; i<m_dwNumBuffers; i++ )
		hr |= m_apDSBuffer[i]->Stop();

	return hr;
}




//-----------------------------------------------------------------------------
// Name: CSound::Reset()
// Desc: Reset all of the sound buffers
//-----------------------------------------------------------------------------
HRESULT CSound::Reset()
{
	if( m_apDSBuffer == NULL )
		return CO_E_NOTINITIALIZED;

	HRESULT hr = 0;

	for( DWORD i=0; i<m_dwNumBuffers; i++ )
		hr |= m_apDSBuffer[i]->SetCurrentPosition( 0 );

	return hr;
}




//-----------------------------------------------------------------------------
// Name: CSound::IsSoundPlaying()
// Desc: Checks to see if a buffer is playing and returns TRUE if it is.
//-----------------------------------------------------------------------------
BOOL CSound::IsSoundPlaying()
{
	BOOL bIsPlaying = FALSE;

	if( m_apDSBuffer == NULL )
		return FALSE; 

	for( DWORD i=0; i<m_dwNumBuffers; i++ )
	{
		if( m_apDSBuffer[i] )
		{  
			DWORD dwStatus = 0;
			m_apDSBuffer[i]->GetStatus( &dwStatus );
			bIsPlaying |= ( ( dwStatus & DSBSTATUS_PLAYING ) != 0 );
		}
	}

	return bIsPlaying;
}




//-----------------------------------------------------------------------------
// Name: CStreamingSound::CStreamingSound()
// Desc: Setups up a buffer so data can be streamed from the wave file into 
//       a buffer.  This is very useful for large wav files that would take a 
//       while to load.  The buffer is initially filled with data, then 
//       as sound is played the notification events are signaled and more data
//       is written into the buffer by calling HandleWaveStreamNotification()
//-----------------------------------------------------------------------------
CStreamingSound::CStreamingSound( LPDIRECTSOUNDBUFFER pDSBuffer, DWORD dwDSBufferSize, 
	CWaveFile* pWaveFile, DWORD dwNotifySize ) 
	: CSound( &pDSBuffer, dwDSBufferSize, 1, pWaveFile, 0 )           
{
	m_dwLastPlayPos     = 0;
	m_dwPlayProgress    = 0;
	m_dwNotifySize      = dwNotifySize;
	m_dwNextWriteOffset = 0;
	m_bFillNextNotificationWithSilence = FALSE;
}




//-----------------------------------------------------------------------------
// Name: CStreamingSound::~CStreamingSound()
// Desc: Destroys the class
//-----------------------------------------------------------------------------
CStreamingSound::~CStreamingSound()
{
}



//-----------------------------------------------------------------------------
// Name: CStreamingSound::HandleWaveStreamNotification()
// Desc: Handle the notification that tells us to put more wav data in the 
//       circular buffer
//-----------------------------------------------------------------------------
HRESULT CStreamingSound::HandleWaveStreamNotification( BOOL bLoopedPlay )
{
	HRESULT hr;
	DWORD   dwCurrentPlayPos;
	DWORD   dwPlayDelta;
	DWORD   dwBytesWrittenToBuffer;
	VOID*   pDSLockedBuffer = NULL;
	VOID*   pDSLockedBuffer2 = NULL;
	DWORD   dwDSLockedBufferSize;
	DWORD   dwDSLockedBufferSize2;

	if( m_apDSBuffer == NULL || m_pWaveFile == NULL )
		return CO_E_NOTINITIALIZED;

	// Restore the buffer if it was lost
	BOOL bRestored;
	if( FAILED( hr = RestoreBuffer( m_apDSBuffer[0], &bRestored ) ) )
		return DXTRACE_ERR( TEXT("RestoreBuffer"), hr );

	if( bRestored )
	{
		// The buffer was restored, so we need to fill it with new data
		if( FAILED( hr = FillBufferWithSound( m_apDSBuffer[0], FALSE ) ) )
			return DXTRACE_ERR( TEXT("FillBufferWithSound"), hr );
		return S_OK;
	}

	// Lock the DirectSound buffer
	if( FAILED( hr = m_apDSBuffer[0]->Lock( m_dwNextWriteOffset, m_dwNotifySize, 
		&pDSLockedBuffer, &dwDSLockedBufferSize, 
		&pDSLockedBuffer2, &dwDSLockedBufferSize2, 0L ) ) )
		return DXTRACE_ERR( TEXT("Lock"), hr );

	// m_dwDSBufferSize and m_dwNextWriteOffset are both multiples of m_dwNotifySize, 
	// it should the second buffer, so it should never be valid
	if( pDSLockedBuffer2 != NULL )
		return E_UNEXPECTED; 

	if( !m_bFillNextNotificationWithSilence )
	{
		// Fill the DirectSound buffer with wav data
		if( FAILED( hr = m_pWaveFile->Read( (BYTE*) pDSLockedBuffer, 
			dwDSLockedBufferSize, 
			&dwBytesWrittenToBuffer ) ) )           
			return DXTRACE_ERR( TEXT("Read"), hr );
	}
	else
	{
		// Fill the DirectSound buffer with silence
		FillMemory( pDSLockedBuffer, dwDSLockedBufferSize, 
			(BYTE)( m_pWaveFile->m_pwfx->wBitsPerSample == 8 ? 128 : 0 ) );
		dwBytesWrittenToBuffer = dwDSLockedBufferSize;
	}

	// If the number of bytes written is less than the 
	// amount we requested, we have a short file.
	if( dwBytesWrittenToBuffer < dwDSLockedBufferSize )
	{
		if( !bLoopedPlay ) 
		{
			// Fill in silence for the rest of the buffer.
			FillMemory( (BYTE*) pDSLockedBuffer + dwBytesWrittenToBuffer, 
				dwDSLockedBufferSize - dwBytesWrittenToBuffer, 
				(BYTE)(m_pWaveFile->m_pwfx->wBitsPerSample == 8 ? 128 : 0 ) );

			// Any future notifications should just fill the buffer with silence
			m_bFillNextNotificationWithSilence = TRUE;
		}
		else
		{
			// We are looping, so reset the file and fill the buffer with wav data
			DWORD dwReadSoFar = dwBytesWrittenToBuffer;    // From previous call above.
			while( dwReadSoFar < dwDSLockedBufferSize )
			{  
				// This will keep reading in until the buffer is full (for very short files).
				if( FAILED( hr = m_pWaveFile->ResetFile() ) )
					return DXTRACE_ERR( TEXT("ResetFile"), hr );

				if( FAILED( hr = m_pWaveFile->Read( (BYTE*)pDSLockedBuffer + dwReadSoFar,
					dwDSLockedBufferSize - dwReadSoFar,
					&dwBytesWrittenToBuffer ) ) )
					return DXTRACE_ERR( TEXT("Read"), hr );

				dwReadSoFar += dwBytesWrittenToBuffer;
			} 
		} 
	}

	// Unlock the DirectSound buffer
	m_apDSBuffer[0]->Unlock( pDSLockedBuffer, dwDSLockedBufferSize, NULL, 0 );

	// Figure out how much data has been played so far.  When we have played
	// past the end of the file, we will either need to start filling the
	// buffer with silence or starting reading from the beginning of the file, 
	// depending if the user wants to loop the sound
	if( FAILED( hr = m_apDSBuffer[0]->GetCurrentPosition( &dwCurrentPlayPos, NULL ) ) )
		return DXTRACE_ERR( TEXT("GetCurrentPosition"), hr );

	// Check to see if the position counter looped
	if( dwCurrentPlayPos < m_dwLastPlayPos )
		dwPlayDelta = ( m_dwDSBufferSize - m_dwLastPlayPos ) + dwCurrentPlayPos;
	else
		dwPlayDelta = dwCurrentPlayPos - m_dwLastPlayPos;

	m_dwPlayProgress += dwPlayDelta;
	m_dwLastPlayPos = dwCurrentPlayPos;

	// If we are now filling the buffer with silence, then we have found the end so 
	// check to see if the entire sound has played, if it has then stop the buffer.
	if( m_bFillNextNotificationWithSilence )
	{
		// We don't want to cut off the sound before it's done playing.
		if( m_dwPlayProgress >= m_pWaveFile->GetSize() )
		{
			m_apDSBuffer[0]->Stop();
		}
	}

	// Update where the buffer will lock (for next time)
	m_dwNextWriteOffset += dwDSLockedBufferSize; 
	m_dwNextWriteOffset %= m_dwDSBufferSize; // Circular buffer

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CStreamingSound::Reset()
// Desc: Resets the sound so it will begin playing at the beginning
//-----------------------------------------------------------------------------
HRESULT CStreamingSound::Reset()
{
	HRESULT hr;

	if( m_apDSBuffer[0] == NULL || m_pWaveFile == NULL )
		return CO_E_NOTINITIALIZED;

	m_dwLastPlayPos     = 0;
	m_dwPlayProgress    = 0;
	m_dwNextWriteOffset = 0;
	m_bFillNextNotificationWithSilence = FALSE;

	// Restore the buffer if it was lost
	BOOL bRestored;
	if( FAILED( hr = RestoreBuffer( m_apDSBuffer[0], &bRestored ) ) )
		return DXTRACE_ERR( TEXT("RestoreBuffer"), hr );

	if( bRestored )
	{
		// The buffer was restored, so we need to fill it with new data
		if( FAILED( hr = FillBufferWithSound( m_apDSBuffer[0], FALSE ) ) )
			return DXTRACE_ERR( TEXT("FillBufferWithSound"), hr );
	}

	m_pWaveFile->ResetFile();

	return m_apDSBuffer[0]->SetCurrentPosition( 0L );  
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::CWaveFile()
// Desc: Constructs the class.  Call Open() to open a wave file for reading.  
//       Then call Read() as needed.  Calling the destructor or Close() 
//       will close the file.  
//-----------------------------------------------------------------------------
CWaveFile::CWaveFile()
{
	m_pwfx    = NULL;
	m_hmmio   = NULL;
	m_pResourceBuffer = NULL;
	m_dwSize  = 0;
	m_bIsReadingFromMemory = FALSE;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::~CWaveFile()
// Desc: Destructs the class
//-----------------------------------------------------------------------------
CWaveFile::~CWaveFile()
{
	Close();

	if( !m_bIsReadingFromMemory )
		SAFE_DELETE_ARRAY( m_pwfx );
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::Open()
// Desc: Opens a wave file for reading
//-----------------------------------------------------------------------------
HRESULT CWaveFile::Open( LPTSTR strFileName, WAVEFORMATEX* pwfx, DWORD dwFlags )
{
	HRESULT hr;

	m_dwFlags = dwFlags;
	m_bIsReadingFromMemory = FALSE;

	if( m_dwFlags == WAVEFILE_READ )
	{
		if( strFileName == NULL )
			return E_INVALIDARG;
		SAFE_DELETE_ARRAY( m_pwfx );

		m_hmmio = mmioOpen( strFileName, NULL, MMIO_ALLOCBUF | MMIO_READ );

		if( NULL == m_hmmio )
		{
			HRSRC   hResInfo;
			HGLOBAL hResData;
			DWORD   dwSize;
			VOID*   pvRes;

			// Loading it as a file failed, so try it as a resource
			if( NULL == ( hResInfo = FindResource( NULL, strFileName, TEXT("WAVE") ) ) )
			{
				if( NULL == ( hResInfo = FindResource( NULL, strFileName, TEXT("WAV") ) ) )
					return DXTRACE_ERR( TEXT("FindResource"), E_FAIL );
			}

			if( NULL == ( hResData = LoadResource( NULL, hResInfo ) ) )
				return DXTRACE_ERR( TEXT("LoadResource"), E_FAIL );

			if( 0 == ( dwSize = SizeofResource( NULL, hResInfo ) ) ) 
				return DXTRACE_ERR( TEXT("SizeofResource"), E_FAIL );

			if( NULL == ( pvRes = LockResource( hResData ) ) )
				return DXTRACE_ERR( TEXT("LockResource"), E_FAIL );

			m_pResourceBuffer = new CHAR[ dwSize ];
			memcpy( m_pResourceBuffer, pvRes, dwSize );

			MMIOINFO mmioInfo;
			ZeroMemory( &mmioInfo, sizeof(mmioInfo) );
			mmioInfo.fccIOProc = FOURCC_MEM;
			mmioInfo.cchBuffer = dwSize;
			mmioInfo.pchBuffer = (CHAR*) m_pResourceBuffer;

			m_hmmio = mmioOpen( NULL, &mmioInfo, MMIO_ALLOCBUF | MMIO_READ );
		}

		if( FAILED( hr = ReadMMIO() ) )
		{
			// ReadMMIO will fail if its an not a wave file
			mmioClose( m_hmmio, 0 );
			return DXTRACE_ERR( TEXT("ReadMMIO"), hr );
		}

		if( FAILED( hr = ResetFile() ) )
			return DXTRACE_ERR( TEXT("ResetFile"), hr );

		// After the reset, the size of the wav file is m_ck.cksize so store it now
		m_dwSize = m_ck.cksize;
	}
	else
	{
		m_hmmio = mmioOpen( strFileName, NULL, MMIO_ALLOCBUF  | 
			MMIO_READWRITE | 
			MMIO_CREATE );
		if( NULL == m_hmmio )
			return DXTRACE_ERR( TEXT("mmioOpen"), E_FAIL );

		if( FAILED( hr = WriteMMIO( pwfx ) ) )
		{
			mmioClose( m_hmmio, 0 );
			return DXTRACE_ERR( TEXT("WriteMMIO"), hr );
		}

		if( FAILED( hr = ResetFile() ) )
			return DXTRACE_ERR( TEXT("ResetFile"), hr );
	}

	return hr;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::OpenFromMemory()
// Desc: copy data to CWaveFile member variable from memory
//-----------------------------------------------------------------------------
HRESULT CWaveFile::OpenFromMemory( BYTE* pbData, ULONG ulDataSize, 
	WAVEFORMATEX* pwfx, DWORD dwFlags )
{
	m_pwfx       = pwfx;
	m_ulDataSize = ulDataSize;
	m_pbData     = pbData;
	m_pbDataCur  = m_pbData;
	m_bIsReadingFromMemory = TRUE;

	if( dwFlags != WAVEFILE_READ )
		return E_NOTIMPL;       

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::ReadMMIO()
// Desc: Support function for reading from a multimedia I/O stream.
//       m_hmmio must be valid before calling.  This function uses it to
//       update m_ckRiff, and m_pwfx. 
//-----------------------------------------------------------------------------
HRESULT CWaveFile::ReadMMIO()
{
	MMCKINFO        ckIn;           // chunk info. for general use.
	PCMWAVEFORMAT   pcmWaveFormat;  // Temp PCM structure to load in.       

	m_pwfx = NULL;

	if( ( 0 != mmioDescend( m_hmmio, &m_ckRiff, NULL, 0 ) ) )
		return DXTRACE_ERR( TEXT("mmioDescend"), E_FAIL );

	// Check to make sure this is a valid wave file
	if( (m_ckRiff.ckid != FOURCC_RIFF) ||
		(m_ckRiff.fccType != mmioFOURCC('W', 'A', 'V', 'E') ) )
		return DXTRACE_ERR( TEXT("mmioFOURCC"), E_FAIL ); 

	// Search the input file for for the 'fmt ' chunk.
	ckIn.ckid = mmioFOURCC('f', 'm', 't', ' ');
	if( 0 != mmioDescend( m_hmmio, &ckIn, &m_ckRiff, MMIO_FINDCHUNK ) )
		return DXTRACE_ERR( TEXT("mmioDescend"), E_FAIL );

	// Expect the 'fmt' chunk to be at least as large as <PCMWAVEFORMAT>;
	// if there are extra parameters at the end, we'll ignore them
	if( ckIn.cksize < (LONG) sizeof(PCMWAVEFORMAT) )
		return DXTRACE_ERR( TEXT("sizeof(PCMWAVEFORMAT)"), E_FAIL );

	// Read the 'fmt ' chunk into <pcmWaveFormat>.
	if( mmioRead( m_hmmio, (HPSTR) &pcmWaveFormat, 
		sizeof(pcmWaveFormat)) != sizeof(pcmWaveFormat) )
		return DXTRACE_ERR( TEXT("mmioRead"), E_FAIL );

	// Allocate the waveformatex, but if its not pcm format, read the next
	// word, and thats how many extra bytes to allocate.
	if( pcmWaveFormat.wf.wFormatTag == WAVE_FORMAT_PCM )
	{
		m_pwfx = (WAVEFORMATEX*)new CHAR[ sizeof(WAVEFORMATEX) ];
		if( NULL == m_pwfx )
			return DXTRACE_ERR( TEXT("m_pwfx"), E_FAIL );

		// Copy the bytes from the pcm structure to the waveformatex structure
		memcpy( m_pwfx, &pcmWaveFormat, sizeof(pcmWaveFormat) );
		m_pwfx->cbSize = 0;
	}
	else
	{
		// Read in length of extra bytes.
		WORD cbExtraBytes = 0L;
		if( mmioRead( m_hmmio, (CHAR*)&cbExtraBytes, sizeof(WORD)) != sizeof(WORD) )
			return DXTRACE_ERR( TEXT("mmioRead"), E_FAIL );

		m_pwfx = (WAVEFORMATEX*)new CHAR[ sizeof(WAVEFORMATEX) + cbExtraBytes ];
		if( NULL == m_pwfx )
			return DXTRACE_ERR( TEXT("new"), E_FAIL );

		// Copy the bytes from the pcm structure to the waveformatex structure
		memcpy( m_pwfx, &pcmWaveFormat, sizeof(pcmWaveFormat) );
		m_pwfx->cbSize = cbExtraBytes;

		// Now, read those extra bytes into the structure, if cbExtraAlloc != 0.
		if( mmioRead( m_hmmio, (CHAR*)(((BYTE*)&(m_pwfx->cbSize))+sizeof(WORD)),
			cbExtraBytes ) != cbExtraBytes )
		{
			SAFE_DELETE( m_pwfx );
			return DXTRACE_ERR( TEXT("mmioRead"), E_FAIL );
		}
	}

	// Ascend the input file out of the 'fmt ' chunk.
	if( 0 != mmioAscend( m_hmmio, &ckIn, 0 ) )
	{
		SAFE_DELETE( m_pwfx );
		return DXTRACE_ERR( TEXT("mmioAscend"), E_FAIL );
	}

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::GetSize()
// Desc: Retuns the size of the read access wave file 
//-----------------------------------------------------------------------------
DWORD CWaveFile::GetSize()
{
	return m_dwSize;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::ResetFile()
// Desc: Resets the internal m_ck pointer so reading starts from the 
//       beginning of the file again 
//-----------------------------------------------------------------------------
HRESULT CWaveFile::ResetFile()
{
	if( m_bIsReadingFromMemory )
	{
		m_pbDataCur = m_pbData;
	}
	else 
	{
		if( m_hmmio == NULL )
			return CO_E_NOTINITIALIZED;

		if( m_dwFlags == WAVEFILE_READ )
		{
			// Seek to the data
			if( -1 == mmioSeek( m_hmmio, m_ckRiff.dwDataOffset + sizeof(FOURCC),
				SEEK_SET ) )
				return DXTRACE_ERR( TEXT("mmioSeek"), E_FAIL );

			// Search the input file for the 'data' chunk.
			m_ck.ckid = mmioFOURCC('d', 'a', 't', 'a');
			if( 0 != mmioDescend( m_hmmio, &m_ck, &m_ckRiff, MMIO_FINDCHUNK ) )
				return DXTRACE_ERR( TEXT("mmioDescend"), E_FAIL );
		}
		else
		{
			// Create the 'data' chunk that holds the waveform samples.  
			m_ck.ckid = mmioFOURCC('d', 'a', 't', 'a');
			m_ck.cksize = 0;

			if( 0 != mmioCreateChunk( m_hmmio, &m_ck, 0 ) ) 
				return DXTRACE_ERR( TEXT("mmioCreateChunk"), E_FAIL );

			if( 0 != mmioGetInfo( m_hmmio, &m_mmioinfoOut, 0 ) )
				return DXTRACE_ERR( TEXT("mmioGetInfo"), E_FAIL );
		}
	}

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::Read()
// Desc: Reads section of data from a wave file into pBuffer and returns 
//       how much read in pdwSizeRead, reading not more than dwSizeToRead.
//       This uses m_ck to determine where to start reading from.  So 
//       subsequent calls will be continue where the last left off unless 
//       Reset() is called.
//-----------------------------------------------------------------------------
HRESULT CWaveFile::Read( BYTE* pBuffer, DWORD dwSizeToRead, DWORD* pdwSizeRead )
{
	if( m_bIsReadingFromMemory )
	{
		if( m_pbDataCur == NULL )
			return CO_E_NOTINITIALIZED;
		if( pdwSizeRead != NULL )
			*pdwSizeRead = 0;

		if( (BYTE*)(m_pbDataCur + dwSizeToRead) > 
			(BYTE*)(m_pbData + m_ulDataSize) )
		{
			dwSizeToRead = m_ulDataSize - (DWORD)(m_pbDataCur - m_pbData);
		}

		CopyMemory( pBuffer, m_pbDataCur, dwSizeToRead );

		if( pdwSizeRead != NULL )
			*pdwSizeRead = dwSizeToRead;

		return S_OK;
	}
	else 
	{
		MMIOINFO mmioinfoIn; // current status of m_hmmio

		if( m_hmmio == NULL )
			return CO_E_NOTINITIALIZED;
		if( pBuffer == NULL || pdwSizeRead == NULL )
			return E_INVALIDARG;

		if( pdwSizeRead != NULL )
			*pdwSizeRead = 0;

		if( 0 != mmioGetInfo( m_hmmio, &mmioinfoIn, 0 ) )
			return DXTRACE_ERR( TEXT("mmioGetInfo"), E_FAIL );

		UINT cbDataIn = dwSizeToRead;
		if( cbDataIn > m_ck.cksize ) 
			cbDataIn = m_ck.cksize;       

		m_ck.cksize -= cbDataIn;

		for( DWORD cT = 0; cT < cbDataIn; cT++ )
		{
			// Copy the bytes from the io to the buffer.
			if( mmioinfoIn.pchNext == mmioinfoIn.pchEndRead )
			{
				if( 0 != mmioAdvance( m_hmmio, &mmioinfoIn, MMIO_READ ) )
					return DXTRACE_ERR( TEXT("mmioAdvance"), E_FAIL );

				if( mmioinfoIn.pchNext == mmioinfoIn.pchEndRead )
					return DXTRACE_ERR( TEXT("mmioinfoIn.pchNext"), E_FAIL );
			}

			// Actual copy.
			*((BYTE*)pBuffer+cT) = *((BYTE*)mmioinfoIn.pchNext);
			mmioinfoIn.pchNext++;
		}

		if( 0 != mmioSetInfo( m_hmmio, &mmioinfoIn, 0 ) )
			return DXTRACE_ERR( TEXT("mmioSetInfo"), E_FAIL );

		if( pdwSizeRead != NULL )
			*pdwSizeRead = cbDataIn;

		return S_OK;
	}
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::Close()
// Desc: Closes the wave file 
//-----------------------------------------------------------------------------
HRESULT CWaveFile::Close()
{
	if( m_dwFlags == WAVEFILE_READ )
	{
		mmioClose( m_hmmio, 0 );
		m_hmmio = NULL;
		SAFE_DELETE_ARRAY( m_pResourceBuffer );
	}
	else
	{
		m_mmioinfoOut.dwFlags |= MMIO_DIRTY;

		if( m_hmmio == NULL )
			return CO_E_NOTINITIALIZED;

		if( 0 != mmioSetInfo( m_hmmio, &m_mmioinfoOut, 0 ) )
			return DXTRACE_ERR( TEXT("mmioSetInfo"), E_FAIL );

		// Ascend the output file out of the 'data' chunk -- this will cause
		// the chunk size of the 'data' chunk to be written.
		if( 0 != mmioAscend( m_hmmio, &m_ck, 0 ) )
			return DXTRACE_ERR( TEXT("mmioAscend"), E_FAIL );

		// Do this here instead...
		if( 0 != mmioAscend( m_hmmio, &m_ckRiff, 0 ) )
			return DXTRACE_ERR( TEXT("mmioAscend"), E_FAIL );

		mmioSeek( m_hmmio, 0, SEEK_SET );

		if( 0 != (INT)mmioDescend( m_hmmio, &m_ckRiff, NULL, 0 ) )
			return DXTRACE_ERR( TEXT("mmioDescend"), E_FAIL );

		m_ck.ckid = mmioFOURCC('f', 'a', 'c', 't');

		if( 0 == mmioDescend( m_hmmio, &m_ck, &m_ckRiff, MMIO_FINDCHUNK ) ) 
		{
			DWORD dwSamples = 0;
			mmioWrite( m_hmmio, (HPSTR)&dwSamples, sizeof(DWORD) );
			mmioAscend( m_hmmio, &m_ck, 0 ); 
		}

		// Ascend the output file out of the 'RIFF' chunk -- this will cause
		// the chunk size of the 'RIFF' chunk to be written.
		if( 0 != mmioAscend( m_hmmio, &m_ckRiff, 0 ) )
			return DXTRACE_ERR( TEXT("mmioAscend"), E_FAIL );

		mmioClose( m_hmmio, 0 );
		m_hmmio = NULL;
	}

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::WriteMMIO()
// Desc: Support function for reading from a multimedia I/O stream
//       pwfxDest is the WAVEFORMATEX for this new wave file.  
//       m_hmmio must be valid before calling.  This function uses it to
//       update m_ckRiff, and m_ck.  
//-----------------------------------------------------------------------------
HRESULT CWaveFile::WriteMMIO( WAVEFORMATEX *pwfxDest )
{
	DWORD    dwFactChunk; // Contains the actual fact chunk. Garbage until WaveCloseWriteFile.
	MMCKINFO ckOut1;

	dwFactChunk = (DWORD)-1;

	// Create the output file RIFF chunk of form type 'WAVE'.
	m_ckRiff.fccType = mmioFOURCC('W', 'A', 'V', 'E');       
	m_ckRiff.cksize = 0;

	if( 0 != mmioCreateChunk( m_hmmio, &m_ckRiff, MMIO_CREATERIFF ) )
		return DXTRACE_ERR( TEXT("mmioCreateChunk"), E_FAIL );

	// We are now descended into the 'RIFF' chunk we just created.
	// Now create the 'fmt ' chunk. Since we know the size of this chunk,
	// specify it in the MMCKINFO structure so MMIO doesn't have to seek
	// back and set the chunk size after ascending from the chunk.
	m_ck.ckid = mmioFOURCC('f', 'm', 't', ' ');
	m_ck.cksize = sizeof(PCMWAVEFORMAT);   

	if( 0 != mmioCreateChunk( m_hmmio, &m_ck, 0 ) )
		return DXTRACE_ERR( TEXT("mmioCreateChunk"), E_FAIL );

	// Write the PCMWAVEFORMAT structure to the 'fmt ' chunk if its that type. 
	if( pwfxDest->wFormatTag == WAVE_FORMAT_PCM )
	{
		if( mmioWrite( m_hmmio, (HPSTR) pwfxDest, 
			sizeof(PCMWAVEFORMAT)) != sizeof(PCMWAVEFORMAT))
			return DXTRACE_ERR( TEXT("mmioWrite"), E_FAIL );
	}   
	else 
	{
		// Write the variable length size.
		if( (UINT)mmioWrite( m_hmmio, (HPSTR) pwfxDest, 
			sizeof(*pwfxDest) + pwfxDest->cbSize ) != 
			( sizeof(*pwfxDest) + pwfxDest->cbSize ) )
			return DXTRACE_ERR( TEXT("mmioWrite"), E_FAIL );
	}  

	// Ascend out of the 'fmt ' chunk, back into the 'RIFF' chunk.
	if( 0 != mmioAscend( m_hmmio, &m_ck, 0 ) )
		return DXTRACE_ERR( TEXT("mmioAscend"), E_FAIL );

	// Now create the fact chunk, not required for PCM but nice to have.  This is filled
	// in when the close routine is called.
	ckOut1.ckid = mmioFOURCC('f', 'a', 'c', 't');
	ckOut1.cksize = 0;

	if( 0 != mmioCreateChunk( m_hmmio, &ckOut1, 0 ) )
		return DXTRACE_ERR( TEXT("mmioCreateChunk"), E_FAIL );

	if( mmioWrite( m_hmmio, (HPSTR)&dwFactChunk, sizeof(dwFactChunk)) != 
		sizeof(dwFactChunk) )
		return DXTRACE_ERR( TEXT("mmioWrite"), E_FAIL );

	// Now ascend out of the fact chunk...
	if( 0 != mmioAscend( m_hmmio, &ckOut1, 0 ) )
		return DXTRACE_ERR( TEXT("mmioAscend"), E_FAIL );

	return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CWaveFile::Write()
// Desc: Writes data to the open wave file
//-----------------------------------------------------------------------------
HRESULT CWaveFile::Write( UINT nSizeToWrite, BYTE* pbSrcData, UINT* pnSizeWrote )
{
	UINT cT;

	if( m_bIsReadingFromMemory )
		return E_NOTIMPL;
	if( m_hmmio == NULL )
		return CO_E_NOTINITIALIZED;
	if( pnSizeWrote == NULL || pbSrcData == NULL )
		return E_INVALIDARG;

	*pnSizeWrote = 0;

	for( cT = 0; cT < nSizeToWrite; cT++ )
	{       
		if( m_mmioinfoOut.pchNext == m_mmioinfoOut.pchEndWrite )
		{
			m_mmioinfoOut.dwFlags |= MMIO_DIRTY;
			if( 0 != mmioAdvance( m_hmmio, &m_mmioinfoOut, MMIO_WRITE ) )
				return DXTRACE_ERR( TEXT("mmioAdvance"), E_FAIL );
		}

		*((BYTE*)m_mmioinfoOut.pchNext) = *((BYTE*)pbSrcData+cT);
		(BYTE*)m_mmioinfoOut.pchNext++;

		(*pnSizeWrote)++;
	}

	return S_OK;
}




